NSO Level 1- Science Olympiad (SOF) Class 8: Questions 622 - 625 of 1076

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Question number: 622

» Combustion and Flame

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MCQ▾

Question

Carbon dioxide gas is a more effective fire extinguisher than water. The possible reason is

Choices

Choice (4) Response

a.

Carbon dioxide forms a blanket around the fire preventing the passage of oxygen

b.

Water is a good conductor of electricity

c.

It is denser than oil

d.

All a. , b. and c. are correct

Question number: 623

» Combustion and Flame

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MCQ▾

Question

The lowest temperature at which a combustible substance catches fire is called its

Choices

Choice (4) Response

a.

Freezing point

b.

Melting point

c.

Ignition temperature

d.

Boiling point

Question number: 624

» Metals and Non-Metals

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Question

Aluminium is used in making aeroplanes. The properties of aluminium which makes it suitable for this purpose is/are

Choices

Choice (4) Response

a.

Malleable

b.

High resistance to corrosion

c.

It is light in weight

d.

All a. , b. and c. are correct

Question number: 625

» Combustion and Flame

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MCQ▾

Question

Aditya and Anagha were assigned a task by their science teacher. She gave both of them the arrangement to boil water as shown in the figure. Aditya has kept his beaker on the outermost part of the flame while Anagha has kept the beaker close to the wick of the candle. Who would be able to boil the water faster?

Image of two beaker with boil water

Image of Two Beaker with Boil Water

Image of two beaker with boil water

Choices

Choice (4) Response

a.

Anagha

b.

Aaditya

c.

All of the above

d.

Question does not provide sufficient data or is vague

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